Parvimonas micra forms a distinct bacterial network with oral pathobionts in colorectal cancer patients

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2024年10月17日

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Thyra Löwenmark,
Linda Köhn,
Therese Kellgren,
William Rosenbaum,
Vicky Bronnec,
Anna Löfgren-Burström,
Carl Zingmark,
Pär Larsson,
Michael Dahlberg,
Bjoern O. Schroeder,
Sun Nyunt Wai,
Ingrid Ljuslinder,
Sofia Edin,
Richard Palmqvist

摘要

Background

Mounting evidence suggests a significant role of the gut microbiota in the development and progression of colorectal cancer (CRC). In particular, an over-representation of oral pathogens has been linked to CRC. The aim of this study was to further investigate the faecal microbial landscape of CRC patients, with a focus on the oral pathogens Parvimonas micra and Fusobacterium nucleatum.

Methods

In this study, 16S rRNA sequencing was conducted using faecal samples from CRC patients (n = 275) and controls without pathological findings (n = 95).

Results

We discovered a significant difference in microbial composition depending on tumour location and microsatellite instability (MSI) status, with P. micra, F. nucleatum, and Peptostreptococcus stomatis found to be more abundant in patients with MSI tumours. Moreover, P. micra and F. nucleatum were associated with a cluster of CRC-related bacteria including Bacteroides fragilis as well as with other oral pathogens such as P. stomatis and various Porphyromonas species. This cluster was distinctly different in the control group, suggesting its potential linkage with CRC.

Conclusions

Our results suggest a similar distribution of several CRC-associated bacteria within CRC patients, underscoring the importance of considering the concomitant presence of bacterial species in studies investigating the mechanisms of CRC development and progression.